QSqlDriver::subscribeToNotification lost if PGSQL server restarts

auto db = QSqlDatabase::addDatabase("QPSQL");
db = QSqlDatabase::database();
db.setHostName(Settings::instance().dBHostname());
db.setUserName(Settings::instance().dBUserName());
db.setPassword(Settings::instance().dBPassword());
db.setDatabaseName(Settings::instance().database());
if(!db.isOpen() && !db.open())
{
  qWarning() << "Could not open database connection!";
  return;
}
if(!db.driver()->subscribeToNotification(internmentsChangedNotificationString())) 
  qDebug() << "Could not subscribe to notification" << internmentsChangedNotificationString(); else qDebug() << "Subscribed to notification" << db.driver()->subscribedToNotifications();